rebrand: rename project from Dispensa Manager to EverShelf

- Update app name across all files (manifest, index.html, README, docs)
- Update contact email to evershelfproject@gmail.com
- Rename Docker service/container/volume to evershelf
- Rename localStorage keys: dispensa_* → evershelf_*
- Rename SQLite DB reference: dispensa.db → evershelf.db
- Update SSH remote to dadaloop82/EverShelf
- Update Apache conf file name to evershelf.conf
- Update CI workflow Docker image/container names
- Update cron job example path
- Add data/dispensa.db to .gitignore to prevent accidental commit

Dockerfile

@@ -29,8 +29,8 @@ RUN [ ! -f /var/www/html/.env ] && cp /var/www/html/.env.example /var/www/html/.
 RUN echo '<Directory /var/www/html>\n\
     AllowOverride All\n\
     Require all granted\n\
-</Directory>' > /etc/apache2/conf-available/dispensa.conf \
-    && a2enconf dispensa
+</Directory>' > /etc/apache2/conf-available/evershelf.conf \
+    && a2enconf evershelf
 
 # Expose port 80
 EXPOSE 80